Geometrical instrument



.1,6236223'1 L. P. KOLODGE GEOMETRI CAL I NSTRUMENT Apfil 5, 1927.

Filed Ooi. 19, 1926' i bungs.

\ companyinfr vPatenteisd Apr. 5, 1927.

ynarran STATES PATENT oFFicE.

i `LoUIsT. Kotonen, or NEW KENSINGTON, PENNSYLVANIA.

GEOMETRICAL INSTRUMENT.

Application-filed. Octoberl, 1926. SerialiN'o. 142,659.

rlhis invention relates to improvements in geometrical instruments, and has more particular reference to an instrument particularly serviceable in numerous 4, operations 4,performed by draftsmen, carpenters and the A morespecitic object of the invention is to provide simple and ef'ective` means forv maintaining the` straight edge member in adjusted position in areliable manner.

A stillfurther object is .-to provide an ,instrument of they above kind; wherein the straight edge member, incertain of its positions of adjustment, cooperates with the square for forming a right-angle triangle, of .a degree` depending upon the adjusted position of'said straight edge member.

Otherobjects willbecome apparent as the nature ofthe invention is better understood, and the ysame consists in the .novel form, combination and arrangement of partsfhereinaft-er more fully described, shown in the ac-` h drawing and claimed. y

ln thel drawing wherein like reference vcharacters i indicate corresponding mrt-s throughout the several views,

L `lligure l isa side elevational view of a V combined wsquarefand adjustable straight edge instrument constructed m accordance.

with the present invention j.

j. Figure 2 isan edge'elevational view thereofloolring toward th-e left of Figure l1;

Figure 3, is an enlarged fragmentary ,sec-

tional view taken, substantially upon 1in@ '-B-of Figure l; f i

Figure 4 is aview similar to Figure 3 "taken upon line 4-4 of Figurel; and*` v.Figure 5 is an `enlarged sectionalview taken upon line 5 5 of Figure l. V r

Referring more in detail to the drawing,

the presentinvention embodies a'square coinposed of rigidly connectedand preferably integrally formed arms 5 and "6 extending at right anglesto eachv other, and an adjustable straight edge member 7 connected one end to the arm 6 so as to be capable of adjustment longitudinally lofthe outer end portion i of the latter as well as capable of swinging relative thereto toward or away fromA the arm 5 as indicated by dotted lines in Figure l. v

The adjacent free ends of the arm and the adjustable straight edge member 7 are beveled along` adjacentedges as at 8 so as to lie in contiguous relation and terminate Hush with eachother at their free ends as at `9 when the other` end of the straight edge member 7 is adjusted to its innermost positionsrelative to the arms 6, whereby a substantially complete 3() degree right-angle triangle is formed. Obviously, byvadjusting the associated end of the straight edge member 7 outwardly-relative to the `arm 6, substantially complete triangles of various degrees of angle maybe formed. Also, by setting the straight edge member at various pivotally adjusted positions toward and is bifurcated to straddle the portion lo of fil' the arm 6, and a clamping screw 12 passes freely through one bifurcation of the mem- Cil ber 7 and freely through the slot l1 and has threaded engagement in an aperture of the other bifurcation ofmember 7..l Thus, upon loosening the screw 12 the straight edgemember'7 will be free, except as hereinafter pointed out, to swing relative to the arm 6 toward and away from the arm 5 ofthe square or to slide longitudinally of the arml 6 for a distance limited onlyby engagement of the screw 12 .withan end of the slot 1l,` i

the latter terminating at its outer end near the outer end of the arm 6 as shown. More-- over, upon tightening the screw l2 the bifurcations of the member 7 may be drawn to-` gether tightly against opposite sides of the reduced portion l0 of arm 6'so that pivotal or sliding adjustment of the member 7 relal l i tive to said arm 6 is prevented under ordinary circumstances.

In order to more securely retain the straight edge member in its adjusted positions relative to the arms and Got the square, an adjustably extensible connection is provided between the adjacent intermediate portions of arm 5 andstraight1 edge member 7, said adjustable connection pret erably embodying a pair of links 13 and 14 which are connected atadjacent ends by a pivot-forming clamping screw so as to be capable of being set and maintained in any desired angular relation, the setting being permitted by loosening the screw 15, and t-hc retention ot' such settingbeing eitiected by tightening the screw 15. As shown, the outer ends of the links 13 and 11 are biturcated to respectively straddle reduced intern'iediate portions 16 and 1T ot the. arm 5 and straight edge member 7, vthe links being pivoted to these members 5 and 7 at these points as at 18 and19.

From the above description it will be seenr that upon loosening the screw 15 the links 13 and 14 will be freely movable relative to each other for folding or unfolding so that the desired pivotal or slidingl adjustments ot the straight edge member 7 relative to the square arm 6 may be effected. It will also be seen that upon tightening the screw 15 after the desired adjustment ot' the straight edge member has been effected, relative n'iovement-s of the links 13 and 11 will be prevented so that the screw 12`will be aided in its function of retaining the straight edge member in the position to which it has been set.

An instrument constructed in accordance with the above may be adjusted and constructed so as to provide a substantially complete right-angle triangle ot any degree between and (it) degrees without beingof objectionable size or form. Moreover, when the straight edge member T is adjusted relative to the arm 6 and used without reference to t-he arm 5 of the square7 the same may be conveniently employed for gaging bevels or miters or ior marking bevels or miter guide lines as is obvious to those skilled in the art. The instrument is capable of usel for many operations readily appa-rent and suggestive to those skilled in the art, so that further description of useful purposes is deemed unnecessary.

In view ol the above it will beI seen that I have provided a very simple and practical form of instrument of the character described which may be readily plated into practical use and which may be manufactured and assembled cheaply and expeditiously.

Minor changes may be made without de,-

parting from the spirit and scope of the invention as claimed.

That I claim as new is 1. A geometrical instrument comprising a square composed ot' rigidly connected arms extended at right angles to each other, a straight edge member, means connect-ing said straight edge member at one end to one 0i said arms for pivotal and sliding movement therealong, and an extensible connection bctween the intermediate portion of the straight edge member and the other arm o1 the square.

2. A geometrical instrument comprising a square composed of rigidly connected arms extended at right angles to each other, a straight edge member, means connecting said straight edge member at one end to one ot' said arms for pivotal and sliding movement therealong, and an extensible connection between the intermediate portion ot' the straight edge member and the other arm ot the square, said extensible connection comprising a pair ol: links respeci'ivel;v pivoted to the straight edge member and said other arm of the square at their outer ends and having their inner ends adjustably hinged together.

3. A geometrical instrument comprising a square composed of rigidly connected arms extended at right angles to each other, a straight edge member, means connecting said straight edge member at one end to one ot' said arms for pivotal and sliding movement therealong, said straight edge member and the 4other arm of t-he square having adjacent edges of their free end portions complementally beveled to lie in contiguous relation with said edges in contact with each other when the pivoted end of the straight edge member is adjusted to its innermost position relative to said one arm of the square. l

et. A geometrical instrument. con'iprising a square embodying a pair otl rigidly connected arms extending at right angles to each other, a straight edge member, means connecting said straight` edge member at one end to the outer end portion of one ot said arms for pivotal and sliding movenient therealong, the means for pivotally connecting said straight edge member to said arm embodying means for securing said end of the straight edge member in any desired position of adjustment when slid longitu LoUIs P. KoLoDGn.

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